This is a tool that analyzes video files and generates individual subtitle files from closed caption data.

CCExtractor currently handles:

• DVDs.
• Most HDTV captures (where transport streams are saved).
• Capture subtitles recorded in bttv format. The number of cards using this card is huge. My test sample is from a Hauppage PVR-250. You can view the full list here.
• DVR-MS.
• Tivo file - ReplayTV file - Dish Network file